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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31755202da2c0a19d8ca175709f9737fa5d99be3183f60eef6326e5f4b586e7' 
  AND token = 'rLyEYTIUVzE3etTiBW2YErRH4cnZj0m7BUOLfon7jWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}